A dump truck body vibrator is designed to facilitate the unloading of materials by vibrating the truck bed, helping to dislodge materials that may stick or compact during transport. While these vibrators are versatile and can handle a wide range of materials, they may not be suitable for all types. 
Dump truck body vibrators are effective for materials like sand, gravel, asphalt, and other aggregates that can compact or stick due to moisture or pressure. They help ensure a more complete and efficient unloading process, reducing the risk of material remaining in the truck bed.
However, there are limitations. For extremely heavy or dense materials, such as large boulders or certain types of industrial waste, the vibrator may not provide sufficient force to dislodge the material effectively. Additionally, materials that are highly cohesive or sticky, such as clay or certain types of wet soil, may not respond well to vibration alone and might require additional methods for effective unloading.
Moreover, the effectiveness of a dump truck body vibrator can also depend on the specific design and power of the vibrator, as well as the construction and condition of the truck bed. Some vibrators are more powerful and better suited for heavy-duty applications, while others are designed for lighter materials.
In summary, while dump truck body vibrators are versatile and can handle a wide range of materials, they may not be suitable for all types, particularly those that are extremely heavy, dense, or sticky. The choice of vibrator should be matched to the specific material and application to ensure optimal performance.